2 ecdsagen.c -- ECDSA key generation and export
3 Copyright (C) 2008 Guus Sliepen <guus@tinc-vpn.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include <openssl/pem.h>
23 #include <openssl/err.h>
24 #include <openssl/obj_mac.h>
32 bool ecdsa_generate(ecdsa_t *ecdsa) {
33 *ecdsa = EC_KEY_new_by_curve_name(NID_secp521r1);
35 if(!EC_KEY_generate_key(*ecdsa)) {
36 logger(LOG_ERR, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
40 EC_KEY_set_asn1_flag(*ecdsa, OPENSSL_EC_NAMED_CURVE);
41 EC_KEY_set_conv_form(*ecdsa, POINT_CONVERSION_COMPRESSED);
46 // Write PEM ECDSA keys
48 bool ecdsa_write_pem_public_key(ecdsa_t *ecdsa, FILE *fp) {
49 BIO *out = BIO_new(BIO_s_file());
50 BIO_set_fp(out,fp,BIO_NOCLOSE);
51 PEM_write_bio_EC_PUBKEY(out, *ecdsa);
56 bool ecdsa_write_pem_private_key(ecdsa_t *ecdsa, FILE *fp) {
57 BIO *out = BIO_new(BIO_s_file());
58 BIO_set_fp(out,fp,BIO_NOCLOSE);
59 PEM_write_bio_ECPrivateKey(out, *ecdsa, NULL, NULL, 0, NULL, NULL);
64 // Convert ECDSA public key to base64 format
66 char *ecdsa_get_base64_public_key(ecdsa_t *ecdsa) {
67 unsigned char *pubkey = NULL;
68 int len = i2o_ECPublicKey(*ecdsa, &pubkey);
70 char *base64 = malloc(len * 4 / 3 + 5);
71 b64encode(pubkey, base64, len);